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==[[Ecosystem]]sEcosystems=====[[Trophic Level]]sLevels of organisation within an ecosystem===*[[Food ChainOrganism]]*[[Food WebPopulation]]*[[BiomassBiological Community]]**[[Pyramid of BiomassHabitat]] ===*[[Environmental FactorsEcosystem]]===
*[[Abiotic Environmental Factors]]
*[[Biotic Environmental Factors]]
*[[Competition (Biology)|Competition]]
*[[GCSE Interdependence (Biology Required Practical: Decay )|Interdependence]]*[[Survival of Organic Materialthe Fittest]]
===Material CyclingThe principle of material cycling===
*[[Water Cycle]]
*[[Carbon Cycle]]
*[[Nitrogen Cycle]]
*[[Decompose (Biology)|Decomposition]]
**[[Decomposer]]s
[[GCSE Biology Required Practical: Decay of Organic Material]]
===Pyramids of biomass and transfer through trophic levels=======[[AdaptationTrophic Level]]s====*[[HabitatFood Chain]]*[[Survival Food Web]]*[[Biomass]]**[[Pyramid of the FittestBiomass]]
===Biodiversity===*[[Biodiversity]]===
*[[Classification Key]]
*[[Sampling (Biology)|Sampling]]
**[[Transect]]
[[GCSE Biology Required Practical: Measuring Population in a Habitat]]
===Human Effect on Ecosystems===
*[[Nature Reserves]]
**[[Deforestation]]
**[[Global Warming]]
===Some of the biological challenges of increasing food yields using fewer resources===
*[[Food Production]]